The nervous system responds to stimuli by sending electrical action potentials along neurons. These neurons then transmit these action potentials to their target cells using neurotransmitters. This response of the nervous system to stimuli is instantaneous and localized.
Hormones are synthesized at a distance from their target cells and travel through the bloodstream or intercellular fluid until they reach these cells. Upon reaching their target cell, the hormones act on the cell to increase or decrease the expression of specific genes.
The nervous system is more precise and localized.
So, the correct answer is option A.